you cant include your form action.. the move method call should be contained in your in init_board1.php (which is your form action)...
if the code you gave is for the file: init_board1.php you should at least check there is request present(otherwise returns error)...
if(isset($_REQUEST['from1'])){
$board_i->move($_REQUEST['from1'],$_REQUEST['to1']);
}
and the previous message:
$board_value['19']="S";
should contain index 0... (e.g. $board_value[0]['19']="S"
can you pack your code and attach it and i will test it (pm or here)..